In addition, users can choose to view a president's approval ratings at the bottom of the timeline. This is really helpful when trying to get students to make connections between a president's popularity and historic events.
The site also has educational activities designed to get students interacting with many of the resources on the site. While I haven't had a chance to look at all of these, the ones I have seem to be pretty good. I'm certain that some will find their way into my classroom.